Senior Java Developer (Low-Latency Payments Systems)

We are seeking an experienced and opinionated Java Developer to join our high-performing engineering team, working on low latency, high-throughput systems in the payments processing domain. This hybrid role is based in the UK or US and offers the opportunity to build scalable, real-time services using modern technologies. If you’re passionate about performance, have strong Core Java and SpringBoot expertise, and thrive in a collaborative yet opinionated engineering culture, we want to hear from you., * Design, develop, and optimize low-latency, high-throughput backend systems using Core Java and SpringBoot.

• Build and maintain RESTful APIs and microservices that power secure payment workflows.
• Work with XML-based messaging standards and protocols commonly used in financial transactions.
• Deploy, monitor, and scale applications in Red Hat OpenShift and AWS cloud environments.
• Integrate with MongoDB and other NoSQL/SQL datastores for real-time data management.
• Collaborate with DevOps, Product, and QA teams to ensure production-grade solutions.
• Participate in architectural discussions, advocate for best practices, and provide mentorship to peers.
• Drive performance tuning, fault tolerance, and observability improvements across services.

• 5+ years of experience in Core Java development with a focus on performance and memory optimization.
• Proficient in SpringBoot and microservice-based architecture.
• Proven experience with low-latency, high-throughput applications (sub-millisecond response times a plus).
• Experience working with XML and message parsing/transformation.
• Hands-on experience deploying applications on Red Hat OpenShift and/or Kubernetes.
• Strong cloud experience with AWS services such as ECS, EKS, Lambda, S3, etc.
• Solid understanding of MongoDB and NoSQL design patterns.
• Prior experience in Payments Processing, financial services, or banking systems.
• Strong communication skills and a bias toward action and opinionated design decisions., * Familiarity with messaging systems (Kafka, RabbitMQ, etc.)
• Exposure to container security and performance tuning on OpenShift.
• Knowledge of payment gateways, ISO 20022, or SWIFT formats.
• Collaborative, fast-paced, and engineering-driven culture. Emphasis on engineering autonomy, architectural decision-making, and clean code.

Who We Are: We are a fast growing business and technology consultant company co-founded in 2019. We offer a custom-tailored, white-glove engineering service fit for our clients, because a digital transformation is more than just technology. With a successful track record of being a preferred vendor for Fortune 500 companies and as a trusted partner for some of the industry’s leading companies, our global talent has helped many clients achieve their goals., Join Our Global Team: We invite you to apply for the position at RE Partners. Join us in shaping the future of business technology consulting and transforming the way organizations thrive in a digital world. As a diverse, woman-owned global business, we pride ourselves on keeping talent happy - our 7% attrition rate speaks volumes. Bring your talented friends along and earn a referral bonus